Core-making device.



s. H; LUNNEY. GORE MAKING DEVIOE. APPLIOATIDK FILED HEFT. '28! 1910.

Patented Apr. 4, 191'1.

mit: 63.963. wvvza dan Mew/Z Elan/eey STEWART H. LUNNEY, OF SAN FRANCISCO, CALIFORNIA.

CORE-MAKING DEVICE.

Specification of Letters Patent.

'Application filed September 28, 1910. Serial No. 584,277.

Patented Apr. 4, 1911.

To all whom 'it may concern Be it known that I, S'rnwairr H. LUNNEY, a citizen of theUnited States, residing in the city and county of San Francisco and State of" California, have invent-cd new and. useful Improvements in Core-Making Devices, of which the following is a specification.

My invention relates to core making devices and particularly to sectional, 'foldable core-print boxes.

With the apparatus at present in common use in foundries and melders rooms, it is possible to 'make only one core-print at a time. This is because, in attempting to torm morer than one core in the core box, it has been found diflicult to trou'el out more than one. i y

It is the object of this invention to construct a print or core box which will facilitate-the making of a plurality of cores at onetime to provide .in combination with the core vbox means for facilitating the locating of the vent wires and reinforcing wires; and to provide in combination With the core box a heaping plate and a hinged foldable casing and a tray or drier plate, all adapted to 't'orm operative and important elements o1 the core making apparatus.

The invention consists oi the parts and the construction and combination oit' parts as hereinafter more fully described and claimed, having reference to the accoiiipanying drawings, .in which;

Figure l is a perspective View ot the core box sections in place upon the hinged closable receiver or casing showing the sections as filled with core material. Fig. 2 -is a transverse vertical section through the closed apparatus. t Fig. 3 is a perspective View ofthe pin section `and heapcr pl atie, the

latter beingpartly in section.

Fig. et is ya detailed sectional view ot the pin carryin section showing the methotils of placing tie vent Wires and threads. Fig.

y 5 is across-section on line :r-:I: of Fig. 3.

In the present embodiment ot iny invention, I employ a core box section ot wood, iron or any other suitable material. and of any appro riate form and proportion the u per sur ace 3, of which is substantially p ane and has recesses, 4 of such configuration as is desired to produce the form of core to be made. The area of this section or block 2 manifestly Will be sullicient to allow for the formation of any number oi? core making recesses 4.- and the section 2 may be bound with a metallic or other strap 5 having perforations 6 for the reception of veut wires 7 which will be of suitable shape and 6U adapted to lie in the core sand, represented at 8 and which is tamped or suitably packed in the recess Il of the box 2.

The core maker usually places the section 2 and the complementary block 9 upon 6y a bench before him and fills the recesses ft of each of the sections with suitable sand, and trowels `olf the surplus material until the sand is substantially Hush with the top smooth surfaces 3. He then inserts the vent Wires 7 through the perforations 6 of the binding strap 5 so that thel vent wires may be depressed slightly into the smooth surt'acc ot" the exposed core sand.

In the event that any portion of the desired core-is curved and that there should be many independent core making recesses 4 iii the molds, I have lfound it expedient to employ void-forming threads 10, which being flexible may be readily made to conform to thc curvature of the parts of the desired core, and another important reason for employing threads to 'form vents is that when one terminus as ll, oi a core recess, docs not' extend to the binding strap 5, the thread may be carried down through a perforation 12 made in thc niold block, and out at the bottoni. 'The threads when used, arc insorted in a suitable needle, which is passed through the perliorations 12,and the core maker then holds one end ot' the thread upon the surface 3 o't the section 2 and pull ing the needle through the perforation l2, thus draws the thread through the block.

'.lhe core maker then places that end o't' the 95 top of this section or block 2 bringing those 100 two parts into proper relative position by inserting doofe] pins 14 projecting from the plate lil into the dowcl holes 15 ot the member 2.

'llie dowcl plate is foi-mcd with slots V1G 105 which haveJ thc saine. generalv contour as the l print recesses -t in the block. The walls lh .o't theslots 16 in the heap plate are preferably tapered outwardly toward the bottom oi the plate as indicated iu Figs. Fl and 5, so

that the wider portion of thcrslots lli lio substantially upon the. trowclcd surface ol' the sand in the mold recesses, though the width ot' the slots 1G at. theiil wider portion is not so `great as the width o'f the top ofthe i 'ln actual I practice, I have found that by utilizing a t recesses '4f ot the mold block 2.

heaping plate 13 with a thickness of approximately an eighth of an inch, though this may be more or less, that by filling the slots l1.6 of this plate with core sand and properly Jcamping the sand, I may then lift the heaping plate 13 from the block 2, leaving a substantial rib, ridge or heap 17 upon the smoother surface ot' the half core-print.

It is because of the difficulty of troweling up this bonding heap that it isdiflicult to make more than one core at a time with the apparatus now commonly used. Even the most expert of core makers, when making intricate cores, inadvertently destroy a heap 17, which they have carefully made upon the half section of the core, even when making a single core-print.

With my apparatus, it is possible to make as many core recesses as desired in the blocks 2 and 9 and the only troweling which is necessary to trowel ott' all the surplus sand on 'each ot the blocks until the sand in the recesses substantially flush with the surfaces 3 of the. blocks. It will thus be seen that it the two sections 2 and 9 were now closed, face to face, then the core would be made complete by the material retained in each of the blocks but these complete halves of the cores would not substantially unite with each other, and it is for the purpose of causing a close union or bond of the two halves of the cores, when the mold blocks are closed face to tace, that the core maker forms the binding heaps 17 upon either one or the other of the mold blocks, and it is to facilitate this making of heaps that I employ the slotted heap plate 13, which when placed l in position, is not easily moved and the ree cess of which may be quickly filled with core sand and the latter tamped, the surplus sand being troweled olf. By using the heaping plate 1B, there is lessrlikelihood ot the core maker dislndging the vent'. torining wires 7 i orthe vent threads 10, because he does not have to troWel or pinch up the heap by handling at all, the plate 13 being substani tion to make a complete core, means secured tial and rigid allows him to quickly till the recesses 16 and firmly press the sand therein Without any danger of dislodging the wires 7. 1

Having in this maniwrformed on one ot the sections, as 2, one-halt" of a core and a heap 17and having forn'ied on the compleinentary section 9 a complete one-haltet a core, he

may then .remove these independent. sections to a receiver' or case composed ot leaves 18, having rec "ses or depressions 19, the walls 20 o t' which are adapted to embrace the bind- 1 ing straps- 5 of the core-print molds 2 and 9 and the leaves being pivoted or hingcdly cnnected as at 21, whereby' after the mold blocks 2 and .9 have been placed upon the closed about their hinges 21 so las to throw the two faces 3 of the core molds quickly together, thus forcing or intruding the heap 17 of the one-half core into the opposite half of the core in the mold block 9, :tor-ming then a complete core. has been completed, the core maker pulls the vent wires 7 and the vent threads 10 from the molds, leaving the continuous vents in the core, after which the leaves 18 may be opened, and the block 9 which is provided with dowel pins 22 for registration with the dowel holes 15 of the member, may be lifted therefrom. This leaves exposed upon v*the at 10. The next operation is to remove the complete cores 10 from the mold block 2 so that they may be carried to a baking oven where they are baked to a suitable hardness.

Having thus described my invention,what I claim and desire to secure by Letters-Pat-Y ent', is;

1. A core making apparatus, comprisizw` a pair of cooperative core box sections, eac having recesses, which when filled, will form a complete one-half of'a core, means whereby 'the two independent sections may Ybe closed face to face, to fornfa completa-.i mold, and an interposed channeled heap forming. plate.

2. A core making apparatus, comprising i mold sections, each provided with recesses I adapted to be brought into close juxtaposition, tomake a complete core and means whereby a bond heap may be .formed upon the core sand containedl in the recesses of one of the mold boxes.

A core making apparatus, comprising mold sections, each provided `withrecesses adapted to be brought. into close juxtaposi tion to make a complete core, means secured to one of said sections to temporarily retain f vent forming wires and means whereby a bonding heap may be formed upon the core material contained in the recesses of, one of the mold boxes,

4. A core making apparatus, comprising fmold sections, each provided with recesses adapted to be brought into close juxtaposil to one of said sections t0 temporarily retain vent forming wires and means whereby a bonding heap may be formed upon the core open leaves 18, these may then be quickly As soon as this operation core block 2, the complete core as indicated material contained in the recesses of one of Itho mold boxes, said means comprising a iplateadapted to be temporarily secured upon its cooperative mold sections, said l plate being provided with slots conforming l in configuration to the recesses in the mold l box. i

l 5. ln a core making apparatus, complea lmentary core box sections having recesses llorm'ed in their contiguous faces, means and means for making a bonding heap upon one of the mold sections, said means includt in a plete provided with clowel pins adaptnh e for insertion into holes in one of the sections, sind plate bemg provlcled with a perforation or erforat1ons, conforming 1n l0 outline to the s :ipe of the reoeses in the sections, the walls of (he perforation in the heaping plut-e being flan-ed toward its cooperative sections.

ln testimony whereof Ihave hereunto set my hand in the presence of two subscribing witnesees.

STEWART H. LUNNEY. 'fnesses:

W. E. PARK, lVM '.l. SomNnmm. 

